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Research on Microstructure Evolution of Al–Al2Cu Eutectic by Regional Melting under Directional Solidification
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2019-09-11 , DOI: 10.1002/crat.201900108 Lei Luo 1 , Cen Wei 1 , Xiang-Ming Li 1 , Xian Wang 1
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2019-09-11 , DOI: 10.1002/crat.201900108 Lei Luo 1 , Cen Wei 1 , Xiang-Ming Li 1 , Xian Wang 1
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Al–Al2Cu eutectic is prepared by regional melting through vacuum directional solidification furnace in an experiment. The effects of different pulling rates, heating power, and transition acceleration on the microstructure evolution of Al–Al2Cu eutectic under directional solidification are analyzed. Four constant growth rates of 3, 6, 9, and 15 mm min−1 are selected for the pulling rate. The primary Al2Cu phase will precede the coupled eutectic phase. The morphology of the irregular faceted primary Al2Cu phase is coarse and the feature of growth is transformed from faceted to non‐faceted as the pulling rate increases. The microstructure at three different heating powers is studied. With the increase of heating power, the primary Al2Cu phase in the alloy decreases, the eutectic structure increases, and the eutectic spacing of the alloy is obviously refined. The pulling rate is changed from 3 to 6 mm min−1, 6 to 9 mm min−1, and 9 to 15 mm min−1, respectively, in directional solidification for transition acceleration. The increase of the pulling rate will change the morphology of the primary Al2Cu phase and produce a partial rod eutectic structure. The lamellar eutectic spacing obtained by transition acceleration is smaller than that obtained by the same constant growth rate.
中文翻译：
定向凝固下区域熔炼Al-Al2Cu共晶组织演变的研究
在实验中，通过真空定向凝固炉对区域进行熔化，从而制备出Al–Al 2 Cu共晶。分析了不同拉速，加热功率和转变加速度对定向凝固条件下Al–Al 2 Cu共晶组织演变的影响。选择3、6、9和15 mm min -1的四个恒定生长速率作为拉拔速率。Al 2 Cu初生相将先于耦合共晶相。不规则多面初生Al 2的形态Cu相是粗糙的，并且随着拉速的增加，生长特征从多面转变为无面。研究了三种不同加热功率下的显微组织。随着加热功率的增加，合金中的初生Al 2 Cu相减少，共晶组织增加，合金的共晶间距明显细化。在用于转变加速的定向凝固中，牵拉速率分别从3到6 mm min -1，6到9 mm min -1和9到15 mm min -1改变。拉速的增加将改变初生Al 2的形貌铜相并产生部分棒状共晶结构。通过过渡加速获得的层状共晶间距小于在相同的恒定增长率下获得的层状共晶间距。
更新日期：2019-09-11
中文翻译：
定向凝固下区域熔炼Al-Al2Cu共晶组织演变的研究
在实验中，通过真空定向凝固炉对区域进行熔化，从而制备出Al–Al 2 Cu共晶。分析了不同拉速，加热功率和转变加速度对定向凝固条件下Al–Al 2 Cu共晶组织演变的影响。选择3、6、9和15 mm min -1的四个恒定生长速率作为拉拔速率。Al 2 Cu初生相将先于耦合共晶相。不规则多面初生Al 2的形态Cu相是粗糙的，并且随着拉速的增加，生长特征从多面转变为无面。研究了三种不同加热功率下的显微组织。随着加热功率的增加，合金中的初生Al 2 Cu相减少，共晶组织增加，合金的共晶间距明显细化。在用于转变加速的定向凝固中，牵拉速率分别从3到6 mm min -1，6到9 mm min -1和9到15 mm min -1改变。拉速的增加将改变初生Al 2的形貌铜相并产生部分棒状共晶结构。通过过渡加速获得的层状共晶间距小于在相同的恒定增长率下获得的层状共晶间距。
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